Grade Rings
24", 30" & 36" Inner Diameter Grade Rings
Grade rings can be added at the manhole access opening which ranges in diameter size between 24”, 30” and 36”. A grade rings main purpose is to adjust a manhole to grade level. Heights of grade rings offered are 3” and 6”.
We follow the ASTM C478 standard
CALPORTLAND CONCRETE PRODUCTS
519 South Benson Avenue, Ontario, CA 91762
CALL US: (909) 983-9789
HOURS
| Monday | 7:00AM-4:00PM PST |
| Tuesday | 7:00AM-4:00PM PST |
| Wednesday | 7:00AM-4:00PM PST |
| Thursday | 7:00AM-4:00PM PST |
| Friday | 7:00AM-4:00PM PST |
| Saturday | Closed |
| Sunday | Closed |